Download from HP source or link below latest ILO version https://pingtool.org/latest-hp-ilo-firmwares/
Extract downlaoded file and you find i.e. ilo5_214.bin in same directory
Login to ILO ip and go to Administartion, iLO FIrmware and upload file above.
Upgrade takes about 10 minutes.
I have performed the upgrade due to SNMP issue when integrating with Zabbix.
Cheers …
